Properties of steady states in turbulent axisymmetric flows.
Properties of steady states in turbulent axisymmetric flows.
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轴对称湍流稳态的特性。
DOI：
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发表时间：
2006
影响因子：
8.6
通讯作者：
F. Daviaud
中科院分区：
文献类型：
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作者：
R. Monchaux;F. Ravelet;Bérengère Dubrulle;A. Chiffaudel;F. Daviaud
本文用实验方法研究了湍流冯卡门流的平均速度场和最可几速度场的性质。这些领域被发现是由两个家庭的功能，预测由最近的统计力学研究三维轴对称流。我们表明，这些功能依赖于粘度和强迫。此外，当雷诺数增加时，我们表现出流动的Beltramization趋势，即，速度-涡度排列这一结果提供了非均匀各向异性湍流中非线性损耗的第一个实验证据。
We experimentally study the properties of mean and most probable velocity fields in a turbulent von Kármán flow. These fields are found to be described by two families of functions, as predicted by a recent statistical mechanics study of 3D axisymmetric flows. We show that these functions depend on the viscosity and on the forcing. Furthermore, when the Reynolds number is increased, we exhibit a tendency for Beltramization of the flow, i.e., a velocity-vorticity alignment. This result provides a first experimental evidence of nonlinearity depletion in nonhomogeneous nonisotropic turbulent flow.